JP2009243538A - Vibration damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping device capable of responding to small amplitude vibration and capable of providing effective damping effect over a wider frequency range. <P>SOLUTION: The vibration damping device comprises; a base member 1; four guide bars 2 erectly provided on the base member 1 and including a side surface extending in a vertical direction; a mass member 3 provided in such a manner that the same can move in the vertical direction with guided by the guide member 2 on the base member 1; four coil springs 4 of which both ends are locked with the mass member 3 and the base member 1 and which is provided between both members and elastically supports the mass member 1 to the base member 3; a rubber elastic body 5 fixed to the mass member 3 via a spacer 7 and provided with forming a minute space with the base member 1; and a support member 6 supporting an upper end of the guide cover 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vibration damping device that is preferably employed to suppress vibration of a building structure such as a house.

  For example, a structure composed of materials that have almost no damping, such as wood, FRP, glass, and steel plate, takes a long time to stop once it starts to vibrate. Various vibration control measures have been taken to suppress the generated vibration.

  For example, as a countermeasure against floor vibration and floor impact sound in building structures such as general houses and apartment houses, a method of increasing the floor weight and improving the damping performance by adding a high specific gravity sound insulation sheet or damping sheet, Alternatively, there is a method of increasing rigidity by reinforcing or adding a beam. However, in any case, the expected effect cannot be obtained, and the cost is increased due to the structural change of the casing and the addition of members.

  As a measure against floor impact noise, there is a method of mounting a vibration damping device such as a dynamic damper, but it is difficult to obtain a sufficient effect on floor vibration and impact sound, and an additional weight of about 15 to 30% with respect to the floor weight. Since (quantity) is required, the problem of cost and weight is inherent.

  Further, as one type of vibration damping device for a structure, for example, a vibration damping device and an impact damper disclosed in Patent Documents 1 to 3 are known. When the housing (top plate, bottom plate) fixed to a vibrating body such as a bridge girder or a structure resonates with the vibrating body, the vibration damping device and the impact damper disclosed in these Patent Documents 1 to 3 are resonated with the vibrating body. A collision mass (independent mass member, weight) collides (abuts) against the housing (top plate, bottom plate). Thereby, based on the energy loss of the kinetic energy (vibration energy) when the collision mass (independent mass member, weight) and the housing (top plate, bottom plate) collide (contact), the amplitude suppression effect on the vibrating body By exhibiting the above, a good vibration damping effect can be obtained over a wide frequency range.

  By the way, in the vibration damping device and the impact damper disclosed in Patent Documents 1 to 3, the collision mass (independent mass member, weight) is freely displaceable or movable at the time of vibration input, and the collision mass (independent In order to allow the mass member, the weight) and the housing (the top plate, the bottom plate) to collide (contact), a predetermined amount is provided between the collision mass (the independent mass member, the weight) and the housing (the top plate, the bottom plate). A gap is provided.

  However, if this gap is too small, the amount of displacement (moving amount) of the collision mass (independent mass member, weight) within the housing (between the top plate and the bottom plate) will be reduced, and those collisions (contact) As a result, energy loss due to the vibration is reduced, so that it is impossible to expect a good vibration suppression effect. Conversely, if it is too loud, the collision sound generated when they collide (contact) increases or vibration with small amplitude It becomes impossible to respond to. Therefore, when setting this gap, it is required to set it to an appropriate range according to each vibration damping device. Note that in Patent Document 2, setting the reciprocating distance of the independent mass member to be 0.1 to 1.6 mm is a preferable range of the minute gap.

In the above vibration damping device and impact damper, the collision mass (independent mass member, weight) and the housing (top plate, bottom plate) collide with each other via an elastic body (elastic material) such as rubber or resin. It is disclosed that the collision sound can be reduced by the configuration of making contact. However, the elastic body (elastic material) arranged between the collision mass (independent mass member, weight) and the housing (top plate, bottom plate) easily wears because those collisions are frequently performed, Since it may be permanently deformed due to aging, etc., a gap (particularly as in Patent Document 2) set between the collision mass (independent mass member, weight) and the housing (top plate, bottom plate) It is very difficult to maintain and manage the minute gap) within an appropriate range.
JP 2002-294626 A Japanese Patent No. 3772715 JP 2006-348996 A

  The present invention has been made in view of the above circumstances, and is capable of responding to vibrations of small amplitude and capable of obtaining an effective damping effect over a wider frequency range. It is a problem to be solved to provide.

  Hereinafter, each means suitable for solving the above-mentioned problems will be described while adding actions and effects as necessary.

  [Means 1] A vibration damping device according to the invention of means 1 is a base member, a guide member having one end fixed to the base member and having a guide surface extending in the vertical direction, and guiding the guide member on the base member. A mass member which is arranged so as to be movable in the vertical direction, and both ends of the mass member and the base member are engaged with each other, and the mass member is arranged between the two members. A spring member that elastically supports the mass member, and is fixed to one of the mass member and the base member, and a minute gap is formed between or in contact with either one of them. And an elastic member arranged in the above state.

  In the vibration damping device according to the invention of means 1, when vertical vibration is input from the vibrating body to the base member, the mass member elastically supported by the spring member is guided by the guide member and resonates in the vertical direction. Thus, the mass member repeatedly collides with the elastic member disposed between the mass member and the base member, and the vibration energy is effectively absorbed by the damping function exhibited by the elastic member at the time of the collision. As a result, an amplitude suppressing effect on the vibrating body is exhibited over a wide frequency range from low frequency to high frequency, and thus a good vibration damping effect can be obtained over a wide frequency range. In addition, this vibration damping device can obtain an effective vibration damping effect over a wide frequency range by using a damping function that is exhibited when the mass member elastically supported by the spring member collides with the elastic member. Therefore, strict tuning of the resonance frequency of the mass member is not required.

  In this vibration damping device, since the mass member is guided by the guide member when the mass member vibrates in the vertical direction, the mass member can reliably collide with the elastic member. Further, since both ends of the spring member are locked to the mass member and the base member, a stable resonance state of the mass member can be obtained, so that the collision between the mass member and the elastic member can be caused stably. Can do. Therefore, a good vibration damping effect by the elastic member can be obtained.

  In addition, the vibration damping device is configured such that the mass member causes vertical movement with a minute acceleration by combining the mass member and a spring member that elastically supports the mass member. The elastic member fixed to either one of the members is disposed in a state in contact with either one of them or in a state in which a minute gap is formed between either one of them. Accordingly, the damping function of the elastic member can be effectively exhibited even when a small amplitude vibration is input, and thus it is possible to respond to a small amplitude vibration.

  In the vibration damping device according to the first aspect of the invention, the elastic member fixed to one of the mass member and the base member is in a state of being in contact with either one of them or between them. It arrange | positions in the state which formed the clearance gap. Here, the state in which the elastic member is in contact with the mass member or the base member is only when the elastic member is in contact with the mass member or the base member in a state where no pressing force is acting on the elastic member (zero touch). In addition, a case where the elastic member is in contact with a pressing force that does not interfere with the damping function during vibration input is also included.

  Further, in the case where a minute gap is set between the elastic member fixed to one of the mass member and the base member and either one of them, the thickness is preferably 1.0 mm or less. Considering the response to vibration, the gap is preferably smaller.

  Therefore, according to the vibration damping device according to the present invention, it is possible to respond to vibration with a small amplitude, and to obtain an effective vibration damping effect over a wider frequency range. In addition, since an effective vibration damping effect is obtained over a wide frequency range using the damping function exhibited by the elastic member, it is not required to strictly tune the resonance frequency of the mass member. The mass member can be easily and advantageously tuned.

  [Means 2] The vibration damping device according to the invention of the means 2 is the vibration damping device according to the means 1, wherein the guide member is constituted by a guide bar erected on the base member, and the mass member is A through hole provided in the guide bar is fitted to the guide bar so as to be relatively movable.

  According to the means 2, when the mass member is guided by the guide bar and vibrates at the time of vibration input, the posture of the mass member is stabilized, so that the effective mass of the mass member when the mass member or the base member collides with the elastic member. Can be improved. This makes it possible to obtain a good vibration damping effect.

  [Means 3] The vibration damping device according to the invention of the means 3 is the vibration damping device according to the means 1 or 2, wherein the base member includes a support member that supports the other end of the guide member. It is said.

  According to the means 3, since the other end of the guide member is supported by the support member, the arrangement position of the guide member and the guide direction by the guide surface are set optimally, so that the mass member is reliably guided in the optimal direction. can do. This makes it possible to obtain a good vibration damping effect.

  [Means 4] The vibration damping device according to the invention of the means 4 is the vibration damping device according to any one of the means 1 to 3, wherein the elastic member is a viscoelastic body or a liquid-filled damper. Yes.

  According to the means 4, it is possible to realize an elastic member that can exhibit a good damping function when the mass member collides. Examples of the viscoelastic body include materials such as a vulcanized or unvulcanized state of a synthetic rubber such as thermoplastic elastomer and butyl rubber, or a vulcanized or unvulcanized state of natural rubber. As the liquid-filled damper, for example, a conventionally known one including a container member having a flexible part that can be elastically deformed at least in part and a liquid sealed inside the container member is used. Can be adopted.

  [Means 5] The vibration damping device according to the invention of the means 5 is the vibration damping device according to any one of the means 1 to 4, wherein the elastic member contacts the mass member or the base member when vibration is input. It has a spherical contact surface.

  According to the means 5, when the mass member is guided by the guide bar and vibrates at the time of vibration input, even if the mass member is inclined, the mass member or the base member reliably collides with the elastic member. A stable impact force between the member and the elastic member can be obtained. This makes it possible to obtain a good vibration damping effect.

  [Means 6] The vibration damping device according to the invention of the means 6 is the vibration damping device according to the means 1, wherein either the mass member or the base member includes the mass member or the base member and the elastic member. It is characterized in that a spacer for adjusting the gap distance between the two is provided.

  According to the means 6, since the collision position between the mass member or the base member and the elastic member can be set appropriately, the damping effect of the elastic member can be efficiently exhibited. The spacer can be provided by using a part of the mass member or the base member. For example, when a spacer is provided on the mass member, a protrusion corresponding to the spacer may be formed integrally with the mass member at a portion where the spacer of the mass member is to be provided. In addition, this spacer is provided as needed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1
FIG. 1 is a front view of the vibration damping device according to the first embodiment, and FIG. 2 is a plan view of the vibration damping device according to the first embodiment.

  As shown in FIGS. 1 and 2, the vibration damping device of the present embodiment includes a base member 1 to which a support member 6 is assembled, four guide bars 2,... The mass member 3 disposed above, the four coil springs 4,..., 4 serving as spring members disposed between the mass member 3 and the base member 1, and the mass member 3 via the spacer 7 And a rubber elastic body 5 as a fixed elastic member.

  The base member 1 is formed in a rectangular plate shape from an iron-based metal. Mounting holes 1a,..., 1a through which guide bars 2,. The base member 1 is assembled with a support member 6 for supporting the guide bars 2,. The support member 6 has a pair of support side plates 6a and 6b that rise up at right angles from both ends of the base member 1, and both ends fixed to the upper ends of the support plates 6a and 6b with bolt screws 6d and 6d. It consists of the support substrate 6c attached so that it may mutually connect. Corresponding to the mounting holes 1a,..., 1a provided in the base member 1, the support substrate 6c is provided with insertion holes 6e,.

  The guide bars 2,..., 2 are bolts that are slightly longer than the length in the height direction of the support side plates 6a, 6b. This bolt has a male thread portion formed only at the tip of the shaft portion. Each of the guide bars 2, ..., 2 is inserted into the mounting holes 1a, ..., 1a of the base member 1 and the insertion holes 6e, ..., 6e of the support substrate 6c from the back surface (lower surface in Fig. 1) side. The nuts 2a,..., 2a are screwed onto the screw portions protruding from the support substrate 6c.

  Thereby, one end (lower end) of the four guide bars 2,..., 2 is fixed to the base member 1 and the other end (upper end) is fixed to the support substrate 6c, and they are parallel to each other at a predetermined distance. It is erected to become. In this case, the part (the male screw is not formed) located between the base member 1 and the support substrate 6c of each guide bar 2, ..., 2 is a part that functions as a guide part. Each guide bar 2,..., 2 has an outer peripheral surface serving as a guide surface extending in the vertical direction when the vibration damping device is installed on the vibrating body.

  The mass member 3 is formed in a rectangular shape so as to have a predetermined mass by an iron-based metal. The mass member 3 is provided with four through holes 3a,..., 3a into which the guide bars 2,. The four through holes 3a,..., 3a have a diameter slightly larger than the diameter of the guide bars 2,..., 2 and are equally arranged in the rectangular horizontal section of the mass member 3. The mass member 3 is disposed between the base member 1 and the support substrate 6c, with the through holes 3a,..., 3a fitted into the guide bars 2,. Thereby, when the vertical vibration is input, the mass member 3 is guided by the guide bars 2,... 2 and can vibrate in the vertical direction.

  The coil springs 4,... 4 are mounted on the outer peripheral sides of the respective guide bars 2, 2, and are disposed between the mass member 3 and the base member 1. Each of the coil springs 4,..., 4 is locked by joining the mass member 3 and the base member 1 with welding or the like at both ends. Thereby, the mass member 3 is elastically supported in a stable state by the four coil springs 4,... 4 with respect to the base member 1.

  The rubber elastic body 5 is formed in a truncated cone shape by a high damping rubber. The rubber elastic body 5 is fixed to the central portion of the lower surface of the mass member 3 via a spacer 7. A minute gap (about 0.3 mm) is formed between the lower front end surface of the rubber elastic body 5 and the base member 1. The minute gap is adjusted by providing the spacer 7 and may be brought into contact with (including a minute pressure contact state) so that there is no gap.

  The vibration damping device of the present embodiment configured as described above is installed and used so that the guide bars 2,... Is done. When vertical vibration is input from the vibrating body to the base member 1, the mass member 3 elastically supported by the coil springs 4,... 4 is guided by the guide bars 2,. As a result, the mass member 3 repeatedly collides with the rubber elastic body 5 disposed between the mass member 3 and the base member 1, and the vibration energy is effective by the damping function exhibited by the rubber elastic body 5 at the time of the collision. To be absorbed. As a result, an amplitude suppressing effect on the vibrating body is exhibited over a wide frequency range from low frequency to high frequency, and thus a good vibration damping effect can be obtained over a wide frequency range.

  In the vibration damping device of the present embodiment, the mass member 3 is guided to the guide bars 2 when the mass member 3 vibrates in the vertical direction, so that the mass member 3 can be reliably collided with the rubber elastic body 5. . Further, since both ends of the coil springs 4,..., 4 are locked to the mass member 3 and the base member 1, a stable resonance state of the mass member 3 can be obtained. 5 can stably occur. Therefore, a good vibration damping effect by the rubber elastic body 5 can be obtained.

  Further, the vibration damping device of the present embodiment is configured such that the mass member 3 is caused to move up and down with a minute acceleration by combining the mass member 3 and the coil springs 4,... 4 that elastically support the mass member 3. In addition, the rubber elastic body 5 fixed to the mass member 3 is disposed in a state in which a minute gap is formed between the rubber elastic body 5 and the base member 1. Thereby, since the damping function of the rubber elastic body 5 can be effectively exhibited even when a small amplitude vibration is input, it is possible to respond to a small amplitude vibration.

  As described above, according to the vibration damping device of the present embodiment, it is possible to respond to vibration with a small amplitude, and an effective vibration damping effect can be obtained over a wider frequency range. In addition, since the damping function exhibited by the rubber elastic body 5 is used to obtain an effective damping effect over a wide frequency range, strict tuning of the natural frequency of the mass member 3 is required. Therefore, the tuning can be performed easily and advantageously.

  Further, in this embodiment, guide bars 2,..., 2 erected on the base member 1 are adopted as guide members, and the mass member 3 has through holes 3a,. ,... Are fitted to 2 so as to be relatively movable. Thus, when the mass member 3 is guided by the guide bars 2,... 2 and vibrates at the time of vibration input, the mass member 3 is stabilized in posture, so that the mass member when the mass member collides with the rubber elastic body 5. The effective mass of the member 3 can be improved and a good vibration damping effect can be obtained.

  Furthermore, in this embodiment, since the other end (upper end) of the guide bars 2,..., 2 is supported by the support member 6 assembled to the base member 1, the guide bars 2,. Since the arrangement position of 2 and the guide direction by the guide surface can be set optimally, the mass member 3 can be reliably guided in the optimal direction. Thereby, a favorable vibration damping effect can be obtained.

[Embodiment 2]
FIG. 3 is a front view of the vibration damping device according to the second embodiment, and FIG. 4 is a plan view of the vibration damping device. As shown in FIGS. 3 and 4, the vibration damping device of the present embodiment has the same basic configuration as that of the first embodiment, and is rubber elastic that is fixed to the lower surface of the mass member 3 via a spacer 7. The configuration differs only in that the body 5 has a convex spherical contact surface that contacts the base member 1 when vibration is input. In this case, the convex spherical portion at the tip of the rubber elastic body 5 is in contact with the base member 1.

  According to the vibration damping device of the present embodiment, even when the mass member 3 is tilted when the mass member 3 is guided by the guide bars 2,. Therefore, a stable impact force between the mass member 3 and the rubber elastic body 5 can be obtained. This makes it possible to obtain a good vibration damping effect.

  In addition, since the other structure is the same as that of the vibration damping device of the first embodiment, only the same reference numerals in FIGS. 3 and 4 are used for common main members, and detailed description thereof is omitted.

It is a front view of the damping device concerning Embodiment 1 of the present invention. It is a top view of the damping device concerning Embodiment 1 of the present invention. It is a front view of the damping device concerning Embodiment 2 of the present invention. It is a top view of the damping device concerning Embodiment 2 of the present invention.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 1 ... Base member 2 ... Guide bar (guide member) 3 ... Mass member 3a ... Through-hole 4 ... Coil spring (spring member) 5 ... Rubber elastic body (elastic member) 6 ... Support member 7 ... Spacer

Claims (6)

A base member;
A guide member having one end fixed to the base member and having a guide surface extending in the vertical direction;
A mass member that is guided by the guide member on the base member and arranged to be movable in the vertical direction;
Both ends of the mass member and the base member are locked and disposed between the two members, and a spring member that elastically supports the mass member with respect to the base member;
Elasticity fixed to one of the mass member and the base member, and arranged in a state where a small gap is formed between the mass member and the base member, or in contact with either one of them. Members,
Damping device characterized by comprising   The guide member is constituted by a guide bar erected on the base member, and the mass member is fitted with a through-hole provided therein so as to be relatively movable on the guide bar. The vibration damping device according to claim 1.   The vibration damping device according to claim 1, wherein the base member includes a support member that supports the other end of the guide member.   The said elastic member is a viscoelastic body or a liquid enclosure damper, The damping device as described in any one of Claims 1-3 characterized by the above-mentioned.   5. The vibration damping device according to claim 1, wherein the elastic member has a spherical contact surface that contacts the mass member or the base member when vibration is input.   The spacer which adjusts the clearance gap between the said mass member or the said base member, and the said elastic member is provided in any one of the said mass member and the said base member. The vibration damping device according to any one of the above.

Images